Just watched the evening news and they have linked women who have the blood group type O having the most fertility issues. Something to do with the hormones and ovum released...

Found an article in your neck of the woods in regards to this!

http://www.telegraph.co.uk/health/healthnews/8084012/Women-with-O-blood-type-may-struggle-to-conceive.html

Wow! I am o+ and didn't really have any problems. I haven't had a chance to read the article yet as I'm on my phone buy will do when I get to work x